Not HBO quality. Poorly made documentary.
I had never heard of this story before, or the Slenderman, and saw an advertisement for this which looked great but it was pretty bad. This was made for Youtube quality at best. It reminded me of something a home user may put on the internet.
It was slow and poorly constructed. It jumped all over with huge gaps on other subjects. At one point you're watching the story, which is not told well, and then it jumps to clips of Bill Gates and these mini segments.
Worst documentary I've seen in a long time. It's too bad the story seemed interesting. The whole thing just felt cheap.